def 1.)
A name started by Hersey kids from mt prospect. was first used to describe the lil buddy named pete, whose face looked somewhat similair to the picture of the baby on the gerber baby food bottles.
def 2.)
has since evolved to describe anything shitty, puny, fatty, or babyish. not good.

To act like a baby or infant
To be a Gerber Baby; have traits similar to that of a baby
To appear or act younger than one's age
To have thin hair like a baby
To be chubby like a baby
To ingest food normally used as sustenance for newborns
To have invested in Gerber Insurance

"Sean, you are such a Gerber Baby!" (Sean is obviously behaving in a gerbish fashion)
"Hey, Gerbs!" (a Gerber Baby's presence is made obvious)
"Yo, Gerbmosis the third!"
(someone obviously has an unhealthy knowledge of Ancient Egyptian monarchs as well as a slow wit)